Fluid flow, combustion and efficiency with early or late inlet valve closing

Fredrik Söderberg*, Bengt Johansson

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

7 Scopus citations

Abstract

This paper is a study of the effects of valve timing and how it influences the in-cylinder fluid flow, the combustion, and the efficiency of the engine. An engine load of 4.0 bar imepnet was achieved by setting the inlet valve closing time early or late to enable unthrottled operation. Inlet valve deactivation was also used and asymmetrical valve timing, i.e. valve timing with the two inlet valves opening and closing at different times. The valve timing was altered by switching cam lobes between the experiments. The results indicate a longer flame development period but a faster combustion with early inlet valve closing compared to the throttled case. For late inlet valve closing, a variation in the combustion duration results. As expected, the pumping mean effective pressure (PMEP) was greatly reduced with early and late inlet valve closing compared to the throttled case.

Original languageEnglish (US)
DOIs
StatePublished - Dec 1 1997
EventInternational Fall Fuels and Lubricants Meeting and Exposition - Tulsa, OK, United States
Duration: Oct 13 1997Oct 16 1997

Other

OtherInternational Fall Fuels and Lubricants Meeting and Exposition
CountryUnited States
CityTulsa, OK
Period10/13/9710/16/97

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering

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